Men greeting Men - Men usually shake hands when greeting one another.  At a first meeting a gentle handshake will suffice and is sometimes combined with slight touches on the arms and/or elbows.  Handshakes may linger a bit.  Good friends and family will engage in a light hug or abrazo which may be combined with a few slaps on the back.

 
Women greeting Women- At a first meeting, women shake hands or give a light touch on the forearm.  Friends and close acquaintances generally kiss each other once on the cheek. 

Greetings between Men & Women-   At a first meeting a regular handshake will do.  Friends, family and close acquaintances usually share a light kiss on the cheek, sometimes with a brief hug.